CN115142971B - Fuel control method and system for range-extended automobile - Google Patents
Fuel control method and system for range-extended automobile Download PDFInfo
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- CN115142971B CN115142971B CN202210886169.6A CN202210886169A CN115142971B CN 115142971 B CN115142971 B CN 115142971B CN 202210886169 A CN202210886169 A CN 202210886169A CN 115142971 B CN115142971 B CN 115142971B
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- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 100
- 239000003921 oil Substances 0.000 claims abstract description 90
- 238000001179 sorption measurement Methods 0.000 claims abstract description 41
- 238000003795 desorption Methods 0.000 claims abstract description 34
- 239000000295 fuel oil Substances 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 21
- 238000012360 testing method Methods 0.000 claims description 21
- 239000002828 fuel tank Substances 0.000 claims description 19
- 238000004364 calculation method Methods 0.000 claims description 17
- 238000005303 weighing Methods 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000001273 butane Substances 0.000 claims description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
- F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
Abstract
The invention discloses a fuel control method and a system for a range-extended automobile, wherein the fuel control method comprises the following steps: s1: setting the opening pressure of the FTIV valve; s2: calculating the carbon tank oil vapor adsorption quantity of the carbon tank under each working condition according to the fuel oil vapor flow under each working condition and the opening time of the FTIV valve; s3: calculating the saturation degree of the carbon tank according to the oil vapor adsorption quantity under each working condition, judging whether the saturation degree of the carbon tank is greater than or equal to a threshold A, if so, entering a step S4; otherwise, repeating the steps S2 and S3; s4: and starting the engine and entering a desorption working condition until the carbon tank is desorbed and cleaned, and closing the engine to enable the automobile to return to an electric mode. The invention can control the evaporation and discharge of the carbon tank on the whole vehicle and solve the desorption problem of the carbon tank through the normal pressure oil tank and FTIV without high pressure and the BCM and ECU controller, thereby greatly reducing the cost.
Description
Technical Field
The invention relates to a fuel control method and a fuel control system for a range-extended automobile.
Background
The problem of insufficient desorption amount of a carbon tank is solved by adopting a high-pressure oil tank in the current range-increasing type automobile so as to meet the IV and VII type experiment requirements in the national six GB183526-2016, and when the high-pressure oil tank is adopted and the whole automobile is used for IV and VII type experiments in the national six GB183526-2016, oil vapor in the oil tank is locked in the oil tank and is discharged into the carbon tank when the pressure exceeds a limit value. The current PHNE and range-extending automobile can effectively control the evaporation and emission of the carbon tank and solve the desorption problem of the carbon tank by adopting the mode, and the system needs a high-pressure oil tank, an oil tank isolation valve and DMTL (leakage diagnosis module), and the high-pressure oil tank, the oil tank isolation valve and the DMTL have too high cost.
Disclosure of Invention
The invention aims to provide a fuel control method and a fuel control system for an extended range automobile, which are used for solving the problem of high desorption cost of the existing carbon tank.
In order to solve the technical problems, the invention provides a fuel control method and a system for a range-extended automobile, wherein the fuel control method comprises the following steps:
s1: setting the opening pressure of the FTIV valve;
s2: calculating the carbon tank oil vapor adsorption quantity of the carbon tank under each working condition according to the fuel oil vapor flow under each working condition and the opening time of the FTIV valve;
s3: calculating the saturation degree of the carbon tank according to the oil vapor adsorption quantity under each working condition, judging whether the saturation degree of the carbon tank is greater than or equal to a threshold A, if so, entering a step S4; otherwise, repeating the steps S2 and S3;
s4: and starting the engine and entering a desorption working condition until the carbon tank is desorbed and cleaned, and closing the engine to enable the automobile to return to an electric mode.
Further, the carbon tank oil vapor adsorption amount calculation under the pressure relief working condition comprises:
monitoring the pressure of the oil tank in real time, when the pressure of the oil tank exceeds P max When the FTIV valve is opened, the opening time t of the FTIV valve is monitored 1n The method comprises the steps of carrying out a first treatment on the surface of the And then calculating the carbon tank oil vapor adsorption quantity L under the pressure relief working condition according to the following formula:
a×t 1n ×k 1 ＝L n
L＝L 1 +L 2 +…+L n
wherein a is the fuel steam flow under the pressure relief working condition; t is t 1n The nth opening time of the FTIV valve is set under the pressure relief working condition; k (k) 1 Is a coefficient; l (L) n The method comprises the steps of opening the FTIV valve for the nth time under the pressure relief working condition to obtain the adsorption quantity of carbon tank oil vapor; p (P) max A maximum pressure is provided for the tank.
Further, coefficient k 1 The calculation method of (1) comprises the following steps:
the carbon tank is enabled to absorb mixed gas consisting of 50% of butane and 50% of nitrogen by volume through butane with the flow rate of 40g/h until the carbon tank reaches a critical point, and the carbon tank is weighed at the moment, and the weighing weight is recorded as A;
adding standard national six-fuel oil with the volume of 40% +/-0.5L into an oil tank, performing hot dipping test on the whole vehicle according to IV type experiment steps in GB183526-2016, monitoring the pressure value of the oil tank in real time, and when the pressure value of the oil tank is P max When the FT is turned onAn IV valve; when the fuel tank pressure value is reduced to the minimum value P of the fuel tank design pressure min Closing the FTIV valve when the valve is closed;
after completion of a complete hot dip test, the total time t of FTIV valve opening is monitored an Simultaneously taking down the carbon tank for weighing, and recording the weighing weight as T an ；
After n hot dip tests were performed, the average coefficient k was obtained by the following formula 1 ：
Wherein t is an Monitoring the total time that the FTIV valve is open after the nth post-test; t (T) an The carbon canister was weighed after the nth test.
Further, the carbon tank oil vapor adsorption amount calculation under the refueling working condition comprises:
opening the FTIV valve when filling at the filling station, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption amount M under the refueling working condition according to the following formula:
b×t 2n ×k 2 ＝M n
M＝M 1 +M 2 +…+M n
wherein b is the fuel steam flow under the refueling working condition, t 2n The nth opening time of the FTIV valve under the refueling working condition; k (k) 2 Is a coefficient; m is M n To the canister oil vapor adsorption during the nth opening of the FTIV valve during fueling conditions.
Further, coefficient k 2 The calculation method of (1) comprises the following steps:
the whole vehicle is carried out according to the VII type experiment step in GB183526-2016, and in a single experiment, the BCM monitors the total time t of opening the FTIV bn Simultaneously taking down the carbon tank for weighing, and recording the weight as T bn After n times, the average coefficient k is obtained 2 ，
Wherein t is bn Monitoring the total time that the FTIV valve is open after the nth test; t (T) bn The carbon tank was weighed after the nth hot dip test.
Further, the amount of carbon canister oil vapor adsorption under the desorption condition includes:
opening the FTIV valve when the carbon tank desorption cleaning is carried out, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption N under the desorption working condition according to the following formula:
(c×t 3n )/k 3 ＝N n
N＝—(N 1 +N 2 +…+N n )
wherein c is the fuel steam flow through the carbon tank battery valve under the desorption working condition, t 3n The nth opening time of the FTIV valve under the refueling working condition; k (k) 3 Is the coefficient, k 3 ＝300；N n And the desorption amount of the carbon tank oil vapor in the process of opening the FTIV valve for the nth time under the desorption working condition.
Further, the calculation formula of the carbon tank saturation degree is as follows:
S＝L+M+N
wherein S is the saturation degree of the carbon tank; l is the adsorption quantity of carbon tank oil vapor under the pressure relief working condition; m is the adsorption quantity of carbon tank oil vapor under the oiling working condition; n is the adsorption quantity of carbon tank oil vapor under the desorption working condition.
Further, the method further comprises:
s5: the FTIV valve was zeroed out and recounting was performed after the condition was reached.
In addition, the invention also provides a fuel control system of the range-extended automobile, which comprises a normal pressure oil tank, an engine communicated with the normal pressure oil tank through an oil delivery pipe and a carbon tank communicated with the normal pressure oil tank through a fuel steam pipe; the fuel steam pipe is provided with a fuel tank pressure sensor and an FTIV valve which are respectively connected with the BCM body control module; the fuel tank pressure sensor is arranged on a fuel steam pipe between the FTIV valve and the normal-pressure fuel tank and is used for monitoring the fuel tank pressure; the BCM body control module is used for controlling the opening and closing of the FTIV valve according to the pressure and the working condition of the oil tank, calculating the saturation degree of the carbon tank according to the fuel control method, and sending a control command to the ECU electronic control unit after judging that the saturation degree of the carbon tank is greater than or equal to a threshold A, and starting the engine to work through the ECU electronic control unit.
The beneficial effects of the invention are as follows: the evaporation and emission of the carbon tank on the whole vehicle can be controlled and the desorption problem of the carbon tank can be solved by the conventional normal-pressure oil tank and FTIV without high pressure and the BCM and ECU controller, so that the cost can be greatly reduced.
Drawings
The accompanying drawings, where like reference numerals refer to identical or similar parts throughout the several views and which are included to provide a further understanding of the present application, are included to illustrate and explain illustrative examples of the present application and do not constitute a limitation on the present application. In the drawings:
FIG. 1 is a schematic diagram of a fuel control system according to one embodiment of the present invention.
Detailed Description
The fuel control method of the extended-range automobile shown in fig. 1 comprises the following steps:
s1: setting the opening pressure of the FTIV valve; to protect the atmospheric tank, the opening pressure of the FTIV valve is designed to be the maximum value of the actual bearing capacity of the atmospheric tank.
S2: calculating the carbon tank oil vapor adsorption quantity of the carbon tank under each working condition according to the fuel vapor flow under each working condition (including a refueling working condition, a pressure relief working condition and a desorption working condition) and the opening time of the FTIV valve;
s3: calculating the saturation degree of the carbon tank according to the oil vapor adsorption quantity under each working condition, judging whether the saturation degree of the carbon tank is greater than or equal to a threshold A, if so, entering a step S4; otherwise, repeating the steps S2 and S3;
s4: and starting the engine and entering a desorption working condition until the carbon tank is desorbed and cleaned, and closing the engine to enable the automobile to return to an electric mode.
S5: the FTIV valve was zeroed out and recounting was performed after the condition was reached.
According to one embodiment of the present application, the canister oil vapor adsorption amount calculation under pressure relief conditions includes:
monitoring the pressure of the oil tank in real time, when the pressure of the oil tank exceeds P max When the FTIV valve is opened, the opening time t of the FTIV valve is monitored 1n The method comprises the steps of carrying out a first treatment on the surface of the And then calculating the carbon tank oil vapor adsorption quantity L under the pressure relief working condition according to the following formula:
a×t 1n ×k 1 ＝L n
L＝L 1 +L 2 +…+L n
wherein a is the fuel steam flow under the pressure relief working condition; t is t 1n For the nth opening time of the FTIV valve under the pressure relief condition (the opening time is the total time of the FTIV valve in the opening state during the nth opening process, and is the same as the following); k (k) 1 Is a coefficient; l (L) n The method comprises the steps of opening the FTIV valve for the nth time under the pressure relief working condition to obtain the adsorption quantity of carbon tank oil vapor; p (P) max A maximum pressure is provided for the tank.
According to one embodiment of the present application, the above coefficient k 1 The calculation method of (1) comprises the following steps:
the carbon tank is enabled to absorb mixed gas consisting of 50% of butane and 50% of nitrogen by volume through butane with the flow rate of 40g/h until the carbon tank reaches a critical point, and the carbon tank is weighed at the moment, and the weighing weight is recorded as A;
adding standard national six-fuel oil with the volume of 40% +/-0.5L into an oil tank, performing hot dipping test on the whole vehicle according to IV type experiment steps in GB183526-2016, monitoring the pressure value of the oil tank in real time, and when the pressure value of the oil tank is P max When the FTIV valve is opened; when the fuel tank pressure value is reduced to the minimum value P of the fuel tank design pressure min Closing the FTIV valve when the valve is closed;
after completion of a complete hot dip test, the total time t of FTIV valve opening is monitored an Simultaneously taking down the carbon tank for weighing, and recording the weighing weight as T an ；
After n hot dip tests were performed, the average coefficient k was obtained by the following formula 1 ：
Wherein t is an Monitoring the total time that the FTIV valve is open after the nth post-test; t (T) an The carbon canister was weighed after the nth test.
According to one embodiment of the present application, a canister oil vapor adsorption amount calculation under refueling conditions includes:
opening the FTIV valve when filling at the filling station, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption amount M under the refueling working condition according to the following formula:
b×t 2n ×k 2 ＝M n
M＝M 1 +M 2 +…+M n
wherein b is the fuel steam flow under the refueling working condition, t 2n The nth opening time of the FTIV valve under the refueling working condition; k (k) 2 Is a coefficient; m is M n To the canister oil vapor adsorption during the nth opening of the FTIV valve during fueling conditions.
According to one embodiment of the present application, the above coefficient k 2 The calculation method of (1) comprises the following steps:
the whole vehicle is carried out according to the VII type experiment step in GB183526-2016, and in a single experiment, the BCM monitors the total time t of opening the FTIV bn Simultaneously taking down the carbon tank for weighing, and recording the weight as T bn After n times, the average coefficient k is obtained 2 ，
Wherein t is bn Monitoring the total time that the FTIV valve is open after the nth test; t (T) bn The carbon tank was weighed after the nth hot dip test.
According to one embodiment of the present application, the canister oil vapor adsorption amount calculation under desorption conditions includes:
opening the FTIV valve when the carbon tank desorption cleaning is carried out, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption N under the desorption working condition according to the following formula:
(c×t 3n )/k 3 ＝N n
N＝—(N 1 +N 2 +…+N n )
wherein c is the fuel steam flow through the carbon tank battery valve under the desorption working condition, t 3n The nth opening time of the FTIV valve under the refueling working condition; k (k) 3 Is the coefficient, k 3 ＝300；N n And the desorption amount of the carbon tank oil vapor in the process of opening the FTIV valve for the nth time under the desorption working condition.
According to one embodiment of the present application, the canister saturation calculation formula is:
S＝L+M+N
wherein S is the saturation degree of the carbon tank; l is the adsorption quantity of carbon tank oil vapor under the pressure relief working condition; m is the adsorption quantity of carbon tank oil vapor under the oiling working condition; n is the adsorption quantity of carbon tank oil vapor under the desorption working condition.
In addition, the invention also discloses a fuel control system of the range-extended automobile, which comprises a normal pressure oil tank, an engine communicated with the normal pressure oil tank through an oil delivery pipe and a carbon tank communicated with the normal pressure oil tank through a fuel steam pipe; the fuel steam pipe is provided with a fuel tank pressure sensor and an FTIV valve which are respectively connected with the BCM body control module; the fuel tank pressure sensor is arranged on a fuel steam pipe between the FTIV valve and the normal-pressure fuel tank and is used for monitoring the fuel tank pressure; the BCM body control module is used for controlling the opening and closing of the FTIV valve according to the pressure and the working condition of the oil tank, calculating the saturation degree of the carbon tank according to the fuel control method, and sending a control command to the ECU electronic control unit after judging that the saturation degree of the carbon tank is greater than or equal to a threshold A, and starting the engine to work through the ECU electronic control unit.
The following describes the specific functions of each working condition with reference to fig. 1:
specific functional description of pressure relief working condition, the tank pressure reaches the maximum design pressure value P max In the time-course of which the first and second contact surfaces,the BCM controls the FTIV valve to open and fuel vapor in the fuel tank is vented to the atmosphere through the FTIV, the canister, the fuel leak diagnostic module, and the ash filter. At this point BCM obtains the canister adsorbed oil vapor by recording FTIV valve open time.
Specific functional description of fueling operating conditions, fuel vapor in the tank is vented to the atmosphere via FTIV, canister, fuel leak diagnostic module, and ash filter during fueling BCM control FTIV valve opening. At this point BCM obtains the canister adsorbed oil vapor by recording FTIV valve open time.
Specific functional description of desorption conditions, during desorption of the engine, the BCM controls the FTIV valve to open, and the oil vapor in the carbon tank is led to the engine through the carbon tank battery valve to participate in combustion. At this point BCM obtains the canister desorbed oil vapor by recording FTIV valve open time.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (7)
1. A fuel control method for a range-extended automobile is characterized by comprising the following steps of
S1: setting the opening pressure of the FTIV valve;
s2: calculating the carbon tank oil vapor adsorption quantity of the carbon tank under each working condition according to the fuel oil vapor flow under each working condition and the opening time of the FTIV valve;
s3: calculating the saturation degree of the carbon tank according to the oil vapor adsorption quantity under each working condition, judging whether the saturation degree of the carbon tank is greater than or equal to a threshold A, if so, entering a step S4; otherwise, repeating the steps S2 and S3;
s4: starting the engine and entering a desorption working condition until the carbon tank is desorbed and cleaned, and closing the engine to enable the automobile to return to an electric mode;
the carbon tank oil vapor adsorption amount calculation under the pressure relief working condition comprises the following steps:
monitoring the pressure of the oil tank in real time, when the pressure of the oil tank exceeds P max When the FTIV valve is opened, the opening time t of the FTIV valve is monitored 1n The method comprises the steps of carrying out a first treatment on the surface of the And then calculating the carbon tank oil vapor adsorption quantity L under the pressure relief working condition according to the following formula:
a×t 1n ×k 1 ＝L n
L＝L 1 +L 2 +…+L n
wherein a is the fuel steam flow under the pressure relief working condition; t is t 1n The nth opening time of the FTIV valve is set under the pressure relief working condition; k (k) 1 Is a coefficient; l (L) n The method comprises the steps of opening the FTIV valve for the nth time under the pressure relief working condition to obtain the adsorption quantity of carbon tank oil vapor; p (P) max Designing a maximum pressure value for the oil tank;
the coefficient k 1 The calculation method of (1) comprises the following steps:
the carbon tank is enabled to absorb mixed gas consisting of 50% of butane and 50% of nitrogen by volume through butane with the flow rate of 40g/h until the carbon tank reaches a critical point, and the carbon tank is weighed at the moment, and the weighing weight is recorded as A;
adding standard national six-fuel oil with the volume of 40% +/-0.5L into an oil tank, performing hot dipping test on the whole vehicle according to IV type experiment steps in GB183526-2016, monitoring the pressure value of the oil tank in real time, and when the pressure value of the oil tank is P max When the FTIV valve is opened; when the fuel tank pressure value is reduced to the minimum value P of the fuel tank design pressure min Closing the FTIV valve when the valve is closed;
after completion of a complete hot dip test, the total time t of FTIV valve opening is monitored an Simultaneously taking down the carbon tank for weighing, and recording the weighing weight as T an ；
After n hot dip tests were performed, the average coefficient k was obtained by the following formula 1 ：
Wherein t is an Monitoring the total time that the FTIV valve is open after the nth post-test; t (T) an For the nth test post-postThe carbon canister is weighed.
2. The method for controlling fuel consumption of an extended range automobile according to claim 1, wherein the calculation of the canister oil vapor adsorption amount under the refueling condition comprises:
opening the FTIV valve when filling at the filling station, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption amount M under the refueling working condition according to the following formula:
b×t 2n ×k 2 ＝M n
M＝M 1 +M 2 +…+M n
wherein b is the fuel steam flow under the refueling working condition, t 2n The nth opening time of the FTIV valve under the refueling working condition; k (k) 2 Is a coefficient; m is M n To the canister oil vapor adsorption during the nth opening of the FTIV valve during fueling conditions.
3. The method for controlling fuel consumption of an extended range automobile according to claim 1, wherein said coefficient k 2 The calculation method of (1) comprises the following steps:
the whole vehicle is carried out according to the VII type experiment step in GB183526-2016, and in a single experiment, the BCM monitors the total time t of opening the FTIV bn Simultaneously taking down the carbon tank for weighing, and recording the weight as T bn After n times, the average coefficient k is obtained 2 ，
Wherein t is bn Monitoring the total time that the FTIV valve is open after the nth test; t (T) bn The carbon tank was weighed after the nth hot dip test.
4. The method for controlling fuel oil of an extended range automobile according to claim 1, wherein the calculation of the canister oil vapor adsorption amount under the desorption condition comprises:
opening the FTIV valve when the carbon tank desorption cleaning is carried out, and monitoring each opening time of the FTIV valve; and then calculating the carbon tank oil vapor adsorption N under the desorption working condition according to the following formula:
(c×t 3n )/k 3 ＝N n
N＝—(N 1 +N 2 +…+N n )
wherein c is the fuel steam flow through the carbon tank battery valve under the desorption working condition, t 3n The nth opening time of the FTIV valve under the desorption working condition; k (k) 3 Is the coefficient, k 3 ＝300；N n And the desorption amount of the carbon tank oil vapor in the process of opening the FTIV valve for the nth time under the desorption working condition.
5. The fuel control method of extended range automobile according to any one of claims 1 to 4, wherein the carbon tank saturation degree calculation formula is:
S＝L+M+N
wherein S is the saturation degree of the carbon tank; l is the adsorption quantity of carbon tank oil vapor under the pressure relief working condition; m is the adsorption quantity of carbon tank oil vapor under the oiling working condition; n is the adsorption quantity of carbon tank oil vapor under the desorption working condition.
6. The method for controlling fuel for an extended range automobile according to claim 1, further comprising:
s5: the FTIV valve was zeroed out and recounting was performed after the condition was reached.
7. The fuel control system of the range-extended automobile is characterized by comprising a normal pressure oil tank, an engine communicated with the normal pressure oil tank through an oil delivery pipe and a carbon tank communicated with the normal pressure oil tank through a fuel steam pipe; the fuel steam pipe is provided with a fuel tank pressure sensor and an FTIV valve which are respectively connected with the BCM body control module; the fuel tank pressure sensor is arranged on a fuel steam pipe between the FTIV valve and the normal-pressure fuel tank and is used for monitoring the fuel tank pressure; the BCM body control module is used for controlling the opening and closing of the FTIV valve according to the pressure of the oil tank and the working condition, calculating the saturation degree of the carbon tank according to the fuel control method of any one of claims 1-6, and then sending a control command to the ECU after judging that the saturation degree of the carbon tank is greater than or equal to a threshold A, and starting the engine to work through the ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210886169.6A CN115142971B (en) | 2022-07-26 | 2022-07-26 | Fuel control method and system for range-extended automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210886169.6A CN115142971B (en) | 2022-07-26 | 2022-07-26 | Fuel control method and system for range-extended automobile |
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| Publication Number | Publication Date |
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| CN115142971A CN115142971A (en) | 2022-10-04 |
| CN115142971B true CN115142971B (en) | 2023-12-29 |
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| CN202210886169.6A Active CN115142971B (en) | 2022-07-26 | 2022-07-26 | Fuel control method and system for range-extended automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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